TRAINING

Drill string assemblies are complex, sophisticated, and utterly essential systems in the oil and gas industry, down to the smallest parts.

The importance of the connections that keep these systems running is not only key for environmental and work efficiency, its also crucial to saving costs  according to reports, a failed connection in offshore drilling comes with an average price tag of $250,000 a day.

Cold root rolling, an independent mechanical process that strengthens the connections in question, may offer the most innovative solution the industry has seen yet.

The Basics

Cold root rolling involves a specialized set of tools that burnish the root radius of a cut thread in a rotary shouldered connection. The tools are versatile, affordable and compatible with the existing equipment at most companies.

Burnishing changes the structure of steel material on a fundamental, atomic level. The work-hardening effect on the surface results in a shift from typical, crystalline steel structure to a dislocated, interlocked steel. The resulting material is less susceptible to shallow cracking and wider structural flaws and damage.

Increased Resistance to Thread Root Stress: One of the by-products of cold root rolling is residual compressive stress, which offsets the tensile stress of service in the crucial regions of a root thread. It decreases the chances for failure while increasing the chances for successful repair.

More In-House Work: With simple, intuitive tools, the process is highly accessible to all kinds of operations.

With this increased strength, studies have shown an increase of three to five times in the joint life of cold root rolled connections. In an unsteady oil and gas industry, less maintenance and downtime promise major advantages for equipment manufacturers. For more information about the benefits of cold root rolling, visit coldrootrolling.com.

Jee
Jee Ltd is the UK's largest independent multi-discipline subsea engineering and training company.
We provide high-calibre, professional training to the oil, gas and renewables industries.
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Wild Well Control
Backed by a heritage of more than 40 years of well control experience, the Wild Well University Well Control Training Program delivers action-oriented curricula designed to challenge students in both individual and team performance scenarios.
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NACE International
With programs developed, peer reviewed, and taught by industry experts, NACE provides corrosion control training and certification to help students launch a career, broaden their expertise, and provide greater industry recognition and credibility.
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